There are four stages in the manufacture of portland cement: (1) crushing and grinding the raw materials, (2) blending the materials in the correct proportions, (3) burning the prepared mix in a kiln, and (4) grinding the burned product, known as “clinker,” together with some 5 percent of gypsum (to control the time of …
How Is Cement Made Step by Step?
Cement is one of the most widely used building materials in the world, and it has been used for centuries. It is made from a mixture of clay, limestone, and other minerals that are heated in a kiln and then ground into a fine powder.
This powder is then mixed with water to create a paste that can be formed into blocks or poured into molds. Here is a step–by–step look at how cement is made.
Step 1: Gather the Raw Materials The first step in making cement is to gather the raw materials. This includes limestone, clay, shale, iron ore, and sand. These materials are quarried and then crushed into a fine powder.
Step 2: Heat the Mixture The next step is to heat the mixture to a very high temperature. This process, known as calcination, takes place in a kiln. The kiln is heated to temperatures as high as 2,700°F, which causes the raw materials to chemically react and form a new substance called clinker.
Step 3: Grind the Clinker Once the clinker has been formed, it is then cooled and ground into a fine powder. This powder is known as cement.